VS
Name
—
CaAl₂(Si₂O₇)(OH)₂·H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Orthorhombic
Crystal system
—
7–7.5
Mohs hardness
—
3.05–3.12
Specific gravity
—
White
Streak
—
Vitreous, greasy
Luster
—
Perfect on {100} and {010}, imperfect on {101}
Cleavage
—
Cmcm
Space group
—
Lawsonite
Structural group
—
Lws · Grandfathered
IMA
—
1895
Named in
—
Blue, Gray, Colorless, Brown
Typical colors
—
Ca · Al · Si · O · H
Elements
—